Fred Camper

First, it depends on what you consider a movie. If you define “cinema” as broadly as I do, then the answer is probably “countless.” So let’s pick something more discrete: feature films (which is what most people mean, anyway, when they say “movie”).

There’s no hard and fast rule as to what constitutes a feature. The term itself is a relic of theater-going: the feature film was the featured film—it was what the theater advertised outside, and presumably what compelled you to purchase a ticket and enter—as opposed to the various newsreels, cartoons, and serial installments that also ran (and then, eventually, stopped running). Theater-going in 2012 seems an increasingly old-fashioned hobby (see Roger Ebert’s recent article on declining ticket sales), but we still use the word to mean “a long film.”